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Method and apparatus for extracting geothermal fluid
242
New Patents
A magnetometer sensor is described for a borehole survey. The magnetometer features a bobbin made from a metal alloy such as coppernickel, which has a very low magnetic permeability, on the order of 1.0001, which can be joined to a magnetic metal alloy, such as Permalloy, by welding, which can be treated by annealing at a temperature of 1500 degrees Fahrenheit and which has a thermal coefficient of expansion generally on the order of the magnetic alloy. In one particular embodiment, the magnetometer sensor comprises a strip of magnetic metal alloy wrapped around the aforesaid bobbin to define a magnetic core, one excitation winding wrapped around the core, a plastic frame for carrying the magnetic core and excitation winding and at least one sense winding wrapped around the frame, the core and the excitation winding. 4866939 METHOD AND APPARATUS FOR EXTRACTING GEOTHERMAL FLUID Sabro Wada, Shimousa, Japan assigned to Japan Oil Engineering Company Ltd A method and an apparatus for extracting geothermal fluid are disclosed. Pressurized and superheated steam is injected into a hot water region below the flashing point of the hot water in the well so as to lower the level of said flashing point in the well, while the well head pressure of a production well drilled into a water-dominated geothermal reservoir is held constant. As a result of this injection, the pressure of water head in the well relative to the pressure of the geothermal reservoir fluid is significantly reduced and both the extraction of connate water and the production of steam at the well head are remarkably enhanced.
of or utilized in an environmentally accepta01e manner. The method includes removing geothermal brine from an underground aquifer, separating non-condensable gases therefrom, and handling the non-condensable gases separately from the processing of the noncondensable gas-free brine to prevent reactions therebetween. An air-free flashed brine handling system is established to prevent contact of air with the flashed brine, and all brine contacted with air is injected into the geothermal brine aquifer through a separate, corrosion-protected injection well. Steam derived from the brine is used to produce electric power, the steam being condensed in the process. The steam condensate is air-cooled, and is used in the steam condensation process. Air-contacted steam condensate is deaerated before being combined with the brine, some of the deaerated condensate being used for scrubbing the steam obtained from the brine. The isolation of non-aerated brine and deaerated condensate from aerated brine, the removal of non-condensable gases from the brine, and the washing of the sludge produced from the brine results in a non-toxic sludge in accordance with government-accepted standards.
4871395 HIGH TEMPERATURE LIGHTWEIGHT FOAMED CEMENTS Toshifumi Sugama assigned to Associated Universities Inc Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed. 4874529
4869066 METHOD FOR THE PRODUCTION OF USABLE STEAM AND NON-TOXIC SOLIDS FROM G E O T H E R M A L B R I N E D Stephe Pye, John L Featherstone, Darrell L Galtup, Gregory A Gritters, Daniel Hoyer, Morton Wong assigned to Union Oil Company of California A method is provided for producing electric power from hot, pressurized geothermal brine containing dissolved toxic elements without significant precipitation of toxic solids. When sludge produced by the process is washed, nontoxic solids arc produced which can be disposed
PROCESS
AND APPARATUS FOR REDUCING THE CONCENTRATION OF SUSPENDED SOLIDS IN CLARIFIED GEOTHERMAL BRINE
John Featherstone, S Timoth Spang, David G Newell, Darrell L Gallup assigned to Union Oil Company of California A process and apparatus is provided for reducing the concentration of fine, residual solids still remaining suspended in clarified geothermal brine overflow from a primary brine clarification stage in which hot, flashed, silica-
New Patents
A magnetometer sensor is described for a borehole survey. The magnetometer features a bobbin made from a metal alloy such as coppernickel, which has a very low magnetic permeability, on the order of 1.0001, which can be joined to a magnetic metal alloy, such as Permalloy, by welding, which can be treated by annealing at a temperature of 1500 degrees Fahrenheit and which has a thermal coefficient of expansion generally on the order of the magnetic alloy. In one particular embodiment, the magnetometer sensor comprises a strip of magnetic metal alloy wrapped around the aforesaid bobbin to define a magnetic core, one excitation winding wrapped around the core, a plastic frame for carrying the magnetic core and excitation winding and at least one sense winding wrapped around the frame, the core and the excitation winding. 4866939 METHOD AND APPARATUS FOR EXTRACTING GEOTHERMAL FLUID Sabro Wada, Shimousa, Japan assigned to Japan Oil Engineering Company Ltd A method and an apparatus for extracting geothermal fluid are disclosed. Pressurized and superheated steam is injected into a hot water region below the flashing point of the hot water in the well so as to lower the level of said flashing point in the well, while the well head pressure of a production well drilled into a water-dominated geothermal reservoir is held constant. As a result of this injection, the pressure of water head in the well relative to the pressure of the geothermal reservoir fluid is significantly reduced and both the extraction of connate water and the production of steam at the well head are remarkably enhanced.
of or utilized in an environmentally accepta01e manner. The method includes removing geothermal brine from an underground aquifer, separating non-condensable gases therefrom, and handling the non-condensable gases separately from the processing of the noncondensable gas-free brine to prevent reactions therebetween. An air-free flashed brine handling system is established to prevent contact of air with the flashed brine, and all brine contacted with air is injected into the geothermal brine aquifer through a separate, corrosion-protected injection well. Steam derived from the brine is used to produce electric power, the steam being condensed in the process. The steam condensate is air-cooled, and is used in the steam condensation process. Air-contacted steam condensate is deaerated before being combined with the brine, some of the deaerated condensate being used for scrubbing the steam obtained from the brine. The isolation of non-aerated brine and deaerated condensate from aerated brine, the removal of non-condensable gases from the brine, and the washing of the sludge produced from the brine results in a non-toxic sludge in accordance with government-accepted standards.
4871395 HIGH TEMPERATURE LIGHTWEIGHT FOAMED CEMENTS Toshifumi Sugama assigned to Associated Universities Inc Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed. 4874529
4869066 METHOD FOR THE PRODUCTION OF USABLE STEAM AND NON-TOXIC SOLIDS FROM G E O T H E R M A L B R I N E D Stephe Pye, John L Featherstone, Darrell L Galtup, Gregory A Gritters, Daniel Hoyer, Morton Wong assigned to Union Oil Company of California A method is provided for producing electric power from hot, pressurized geothermal brine containing dissolved toxic elements without significant precipitation of toxic solids. When sludge produced by the process is washed, nontoxic solids arc produced which can be disposed
PROCESS
AND APPARATUS FOR REDUCING THE CONCENTRATION OF SUSPENDED SOLIDS IN CLARIFIED GEOTHERMAL BRINE
John Featherstone, S Timoth Spang, David G Newell, Darrell L Gallup assigned to Union Oil Company of California A process and apparatus is provided for reducing the concentration of fine, residual solids still remaining suspended in clarified geothermal brine overflow from a primary brine clarification stage in which hot, flashed, silica-